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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c232e34751e07e95e2ef6c2981dc9b6f582980335d005f335a5a953b0e5476c1' 
  AND token = 'pTdPa6t+j5V3QvfVOc9rLkSidQk8/i/hAzeJu+ejJgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}